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DISEQUAZIONI
DI PRIMO
GRADO
E
PROBLEMI DI
SCELTA
Risolvi le disequazioni

(

)

1) x ⋅ ( x − 1) + x  2 ⋅ x + x + 6
2

2

2) 2 x − 6 ≥ ( x + 3) − x ⋅ ( x + 4)
3) − 5 ⋅ ( 2 x − 2) − 4 ⋅ ( 3x − 6)  4 ⋅ ( x − 7 ) − 2( x − 3)
1− x
4) x +
 2x − 1
3
6x + 5
4x − 1
5)
−1≤
3
2
2
PROBLEMA
Due amici vogliono imparare a ballare. Nella loro città ci sono
due scuole di ballo che si possono frequentare alle seguenti condizioni:
Scuola 1 - € 320,00 annue di iscrizione più € 5,00 per ogni ora di utilizzo
Scuola 2 - € 240,00 annue di iscrizione più € 6,00 per ogni ora di utilizzo
Quale scuola conviene scegliere ?
1) Della seguente disequazione, verificare se i valori a lato sono soluzioni.

1 − 2x ≥ 0

x =0

x =2

x=

5
2

x=

1
3

Per la seguente disequazione scrivi le disequazioni ad essa equivalenti
ottenute operando come indicato a lato.
2)

4 − 6 x ≥ 10 − 3 x

1)

sottrai

4

2)

aggiungi

3x

3) moltiplica per
4) dividi per 3

−1

3) Risolvi la disequazione e rappresenta graficamente e simbolicamente le soluzioni.

( x − 1) 2 − 3x ≥ ( x − 3) ⋅ ( x + 3)

4) Risolvi il problema
Il noleggio di una macchina costa 50 € al giorno più 40 cent per ogni Km
percorso, quanti Km si riescono a percorrere ogni giorno se non si vuole spendere
più di 200?

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Esercizi modificato

  • 2. Risolvi le disequazioni ( ) 1) x ⋅ ( x − 1) + x  2 ⋅ x + x + 6 2 2 2) 2 x − 6 ≥ ( x + 3) − x ⋅ ( x + 4) 3) − 5 ⋅ ( 2 x − 2) − 4 ⋅ ( 3x − 6)  4 ⋅ ( x − 7 ) − 2( x − 3) 1− x 4) x +  2x − 1 3 6x + 5 4x − 1 5) −1≤ 3 2 2
  • 3. PROBLEMA Due amici vogliono imparare a ballare. Nella loro città ci sono due scuole di ballo che si possono frequentare alle seguenti condizioni: Scuola 1 - € 320,00 annue di iscrizione più € 5,00 per ogni ora di utilizzo Scuola 2 - € 240,00 annue di iscrizione più € 6,00 per ogni ora di utilizzo Quale scuola conviene scegliere ?
  • 4. 1) Della seguente disequazione, verificare se i valori a lato sono soluzioni. 1 − 2x ≥ 0 x =0 x =2 x= 5 2 x= 1 3 Per la seguente disequazione scrivi le disequazioni ad essa equivalenti ottenute operando come indicato a lato. 2) 4 − 6 x ≥ 10 − 3 x 1) sottrai 4 2) aggiungi 3x 3) moltiplica per 4) dividi per 3 −1 3) Risolvi la disequazione e rappresenta graficamente e simbolicamente le soluzioni. ( x − 1) 2 − 3x ≥ ( x − 3) ⋅ ( x + 3) 4) Risolvi il problema Il noleggio di una macchina costa 50 € al giorno più 40 cent per ogni Km percorso, quanti Km si riescono a percorrere ogni giorno se non si vuole spendere più di 200?